High strength brass



Patented June 29, 1937 UNITED- STATES PATENT OFFICE 2,085,416 man STRENGTH nnns's Michael George 0011011. New York, N. Y., assignor to Union Carbide and Garbon Research Laboratories, Inc., a corporation of New York No Drawing. Application october 6, 1936 Serial No. 104.233

6 Claims. (01. 75-455) The invention relates to high strength brass containing, as essential constituents, copper, zinc,

usually contain in addition to copper, about 33% to 46% zinc, and substantial amounts of aluminum, manganese, iron and, tin. Some also contain ni kel, and still others, lead. A typical compositi contains 38% zinc, 1.5% aluminum, 2% manganese, 1.5% iron, 1% nickel, remainder co'pp'er. Such an alloy, when suitably wrought and heat treated, will have a'yield' point'of about 45,000 pounds per square inch, a tensile strength of about 95,000 pourifis per square inch, an elongation (ratio. of gage length to diameter being 4) of about and a Brinell hardness (500 kg; load) of about 160. It has been claimed that W some high strength brasses attain a tensile strength as great as 110,000 pounds per square diameter of 4) of at least 5%, and preferably at least 10%; ,and a Brinell hardness (500 kg. load) of about 200 or higher. Another object of the invention to provide a high strength brass which retains a relatively high strength at ele- ,vated temperatures up to about 450 C. A further object is to provide a high strength brass having, a relatively great v resistance to corrosion.

I have discovered that the abovefand other,

having a composition within the following lim its:

Table A Preferred e range;

Percent metal Z'ml' Z) 11 ase.- 13 9 Aluminum 7. 5 5. 5

Copper. 75 V 65 to to to to Preferably, no metals other than copper, zinc, manganese,- and aluminum are present in significant amounts; but small amounts of other metals, for instance, not exceeding 2% nickel,

objects of the invention are attained in a brass V 1% cobalt, 5% iron, or 0.5% each of chromium or vanadium, may be added without utterly destroying the desirable properties of the alloy. My discovery has been verified by the making and testing of over one hundred alloy compositions within and outside the ranges of composition specified above in'table A. Typical results of these tests on compositions within the said range are set forth in table 28.

Table 3 Anal Yield Ultimate Perm,

point strength elongation P P P thousands thousands L Y Percent i of lbs. per 0! lbsinper -4.

Zn Mn A! o sq. in. sq.

t as disclosed in my prior application-Serial- Number 702,035, especially useful compositions are those comprised within the limits of 15% 20% zinc, 5 t0 9% aluminum, 4.5% t0 12% manganese, and the remainder copper; the cop.-

per being more than the sum of thealu- .minum and manganese percentages being between 13% and 18%; and the aiuminumconnum, remainder substantially all copper, the.

copper content being 63% to 75% of the brass. 2. High strength brass having in the as-rolled and annealed condition a tensile strength above 100,000 pounds per square inch'and an elongation under tension,o f at least 5%, which brass has a composition within the limits? 11% to18% zinc, 9% to 12% manganese, 5.5% to7% aluminum, remainder substantially all copper, the

3. High strength brass having approximately copper content being 65% to of the brass."

the composition: 11% zinc, 12% manganese, -7%

and 70% copper.

nese, and the. remainder copper; the sum of the aluminum and manganese percentages being between 13% and 18%; and the aluminum'constituting at least one-thirdand not over onehalf of said sum; and the copper amounting to more than 65% of the alloy.

6. A copper base alloy which has a tensile strength above 100,000 pounds per square inch, an elongation under tension of at least 5%, and a composition within the limits: 10% to 20% zinc, 5% to 9% aluminum, 4.5% to 13% manganese. and the remainder substantially all copper, the copper amounting to at least 63% of the brass. v

' MICHAEL GEORGE CORSON. 

